I have spent a few days trying to get the custom sort to work on Quote Line Items on multiple fields.   I googled and searched the forums and found lots of helpful code that got me started.   I created a global class for sorting and have a webservice function that correctly works.   I added the custom javascript button like the forum says and that works.  The problem with this is when the user clicks the sort button, it brings up a screen with the product names in the sorted order.  So if the user clicks save.  It all good.  But the user sees a screen with a list with only product names and not the other fields that are being sorted.  So I created a custom page which almost works.  It shows the sort fields in the list.  The arrows work but the save and cancel button are broken.   

Get this error: Unable to Access Page
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Not sure how to debug to find out what fields is missing and if this approach that I am doing will work.  ANY CLUES??
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<apex:page standardController="Quote">
 
<apex:variable var="QuoteName" value="{!Quote.Name}"/>
<apex:variable var="QuoteNumber" value="{!Quote.QuoteNumber}"/>
<apex:variable var="QuoteID" value="{!Quote.ID}"/>

<!-- <apex:pageBlock title="Sort Line Items for Quote {!Quote.Name}" mode="edit"> -->
<apex:pageBlock mode="edit">

<apex:sectionHeader title="Quote" subtitle="{!Quote.Name}"/>

<apex:outputText value="Custom Sort: Use the arrows to sort the products into the desired order."/>

<table cellpadding="0"  cellspacing="0" border='1'>

<form action="/oppitm/lineitemsort.jsp" id="editPage" method="post" name="editPage"
      onsubmit="javascript&colon;saveAllSelected([ document.editPage.duel_select_0 ], [ document.editPage.duel0 ], ',', '\\', '--None--');if (window.ffInAlert) { return false; }" >

<input type="hidden" name="id"     id="id"     value="{!QuoteID}" />
<input type="hidden" name="duel0"  id="duel0"  value="" />
<input type="hidden" name="retURL" id="retURL" value="/{!QuoteID}" />
<input type="hidden" name="save"   id="save"   value=" Save " />

<input type="hidden" name="_CONFIRMATIONTOKEN" id="_CONFIRMATIONTOKEN" value="yQN58ySIY4QOYgFqpKp7921vvbV7VYmaQ5EoYKczxj5dNazdime9nNepdEnPMDabtWtrxQDk38.EWXdTnHtzykYF0rEp4.1AyPH2wH4b2bLTFxF5eYqkkGO5karLiujBR4sYwu.vOvDCJVC.2wHWAmRr.0Y=" />
<input type="hidden" name="cancelURL"    id="cancelURL"    value="/{!QuoteID}" />
<input type="hidden" name="save_new_url" id="save_new_url" value="/oppitm/lineitemsort.jsp" />
    <tr>
        <td>
            <div class="duelingListBox" id="duel">
                <div class="errorMsg" id="editPage_duel_errorMsg" style="display:none">&nbsp;</div>          
                <table class="layout">
                    <tr>
                        <td class="selectCell">
                            <div class="selectTitle">
                                <label for="duel_select_0">Products</label>
                            </div>
                            <select id="duel_select_0" multiple="multiple" name="duel_select_0" size="25">
                                <apex:repeat var="lines" value="{!Quote.QuoteLineItems}">       
                                    <option value="{!lines.Id}">
                                       <!-- <apex:outputText value=" {2}  (Qty={0}   BeginDate={1,date, MM-dd-yyyy}) "> -->
                                       <apex:outputText value=" Qty={0, number, ###,###,###}   BeginDate={1,date, MM-dd-yyyy}   Prd={2}">
                                            <apex:param value="{!lines.Quantity}"/>
                                            <apex:param value="{!lines.BeginDate__c}"/>
                                            <apex:param value="{!lines.ProductName__c}"/>
                                        </apex:outputText>                                                                      
                                    </option>
                                </apex:repeat>
                            </select>
                        </td>
                        <td class="buttonCell">
                            <div class="text">Top</div>
                            <div class="text">
                                <ahref="javascript&colon;window.editPage_DLBEInstance.instMoveTop(document.editPage.duel_select_0,'editPage_duel_errorMsg');">
                                    <img src="/s.gif" alt="Top"  class="doubleArrowUp" title="Top"/>
                                </a>
                            </div>
                            <div class="text">Up</div>
                            <div class="text">
                                <a href="javascript&colon;window.editPage_DLBEInstance.instMoveUp(document.editPage.duel_select_0, null, null, null,'editPage_duel_errorMsg');" id="duel_select_0_up"><img src="/s.gif" alt="Up"  class="upArrowIcon" title="Up"/></a>
                            </div>
                            <div class="text">
                                <a href="javascript&colon;window.editPage_DLBEInstance.instMoveDown(document.editPage.duel_select_0, null, null, null,'editPage_duel_errorMsg');" id="duel_select_0_down"><img src="/s.gif" alt="Down"  class="downArrowIcon" title="Down"/></a>
                            </div>
                            <div class="text">Down</div>
                            <div class="text">
                                <a href="javascript&colon;window.editPage_DLBEInstance.instMoveBottom(document.editPage.duel_select_0,'editPage_duel_errorMsg');"><img src="/s.gif" alt="Bottom"  class="doubleArrowDwn" title="Bottom"/></a>
                            </div>
                            <div class="text">Bottom</div>
                        </td>
                    </tr>
                </table>
            
                <script  type="text/javascript">window.editPage_DLBEInstance=new DuelingListBoxesElement(['duel_select_0'],'editPage_duel_errorMsg');
                </script>
            </div>
        </td>
    </tr>
    <tr>
        <td align="center">
            <input value=" Save "  class="btn" name="save"   title="Save"   type="submit"/>&nbsp;&nbsp;&nbsp;
            <input value="Cancel"  class="btn" name="cancel" title="Cancel" type="submit"/>
        </td>
    </tr>
</form>
</table>
</apex:pageBlock>

</apex:page>